Abstract
Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided. Variable rate codes are provided that combine various fixed rate codes in a manner that results in codes whose rates are dependent on all the various fixed rate codes that are combined
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Specification Information
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Technologies
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Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
2. A method of receiving signals transmitted by three antennas comprising:
receiving, from each of the three antennas, a respective sequence of OFDM symbols, wherein the respective sequence of OFDM symbols comprises,
a plurality of the OFDM symbols having a plurality of OFDM sub-carriers carrying data,
at least one pilot of a first antenna of the three antennas that is adjacent in one of time or frequency to a pilot of a second antenna of the three antennas, and
the at least one pilot of the first antenna of the three antennas is adjacent in the other of the time or frequency to a pilot of a third antenna of the three antennas; and decoding the respective sequence of OFDM symbols to generate the received signals.
43. The method of claim 42, wherein the pilots for the three antennas are grouped collectively in groups of pilots, each of the groups of pilots containing the pilot associated with the first antenna, the pilot of the second antenna, and the pilot of the third antenna, the groups of pilots being scattered in time and frequency.
44. The method of claim 43, wherein each group of pilots comprises a first and a second pilot on a first OFDM sub-carrier, the first and second pilot are over two time intervals and a third pilot on an adjacent OFDM sub-carrier located in the same time intervals as the first and second pilot on the first OFDM sub-carrier.
45. The method of claim 42, wherein the respective sequence of OFDM symbols are received on two receive antennas.
46. The method of claim 42, further comprising:
determining channel information derived from the pilot symbols; and generating channel estimates based on the respective sequence of OFDM symbols.
47. The method of claim 42, wherein said receiving and decoding are performed by a mobile station.
48. The method of claim 42, wherein said receiving and decoding are performed by a base station.
49. A receiver, comprising:
a plurality of receive antennas; and processing hardware coupled to the plurality of receive antennas, wherein the processing hardware is configured to:
receive, from each of the three transmit antennas, a respective sequence of OFDM symbols, wherein the respective sequence of OFDM symbols comprises,
a plurality of the OFDM symbols having a plurality of OFDM sub-carriers carrying data,
at least one pilot of a first transmit antenna of the three transmit antennas that is adjacent in one of time or frequency to a pilot of a second transmit antenna of the three transmit antennas, and
the at least one pilot of the first transmit antenna of the three transmit antennas is adjacent in the other of the time or frequency to a pilot of a third transmit antenna of the three transmit antennas, and
decode the respective sequence of OFDM symbols to generate the received signals.
50. The receiver of claim 49, wherein the plurality of receive antennas comprises one of two, three or four receive antennas.
51. The receiver of claim 49, wherein the processing hardware comprises one of an application specific integrated circuit, a digital signal processing chip, or a ield programmable gate array.
52. The receiver of claim 49, wherein the pilots for the three transmit antennas are grouped collectively in groups of pilots, each of the groups of pilots containing the pilot associated with the first transmit antenna, the pilot of the second transmit antenna, and the pilot of the third transmit antenna, the groups of pilots being scattered in time and frequency.
53. The receiver of claim 52, wherein each group of pilots comprises a first and a second pilot on a first OFDM sub-carrier, the first and second pilot are over two time intervals and a third pilot on an adjacent OFDM sub-carrier located in the same time intervals as the first and second pilot on the first OFDM sub-carrier.
54. The receiver of claim 49, wherein the processing hardware is further configured to:
determine channel information derived from the pilot symbols; and generate channel estimates based on the respective sequence of OFDM symbols.
55. The receiver of claim 49, wherein the respective OFDM symbols are transmitted by using a rate=2 space-time block code over the three transmit antennas.
56. A method for transmitting on four antennas, comprising:
pre-coding information bits to generate four transmit symbols, wherein the pre-coding comprises generating the four transmit symbols by mapping M information hits as two sets of M/2 bits, wherein a first set of M/2 bits is mapped to produce first and third transmit symbols, wherein a second set of M/2 bits is mapped to produce second and fourth transmit symbols wherein precoding comprises a precoding matrix multiplication; encoding two of the transmit symbols into a first Alamouti matrix and encoding another two of the transmit symbols into a second Alamouti matrix; and transmitting the two Alamouti matrices on four antennas on four time intervals or four frequencies by,
transmitting the first Alamouti matrix on two antennas during two of the four time intervals or at two of the four frequencies, and
transmitting the second Alamouti matrix on the other two antennas during the other two of the four time intervals or at the other two of the four frequencies, wherein the pre-coding and encoding are such that all of the information bits are represented in what is transmitted from each of the four antennas.
57. The method of claim 56, wherein the first and second transmit symbols are encoded in the first Alamouti matrix and the third and fourth transmit symbols are encoded in the second Alamouti matrix.
58. The method of claim 56, wherein the first set of M/2 bits is mapped on a first and a third mapping constellation to produce the first and third transmit symbols, and wherein the second set of M/2 bits is mapped on a second and a fourth mapping constellation to produce the second and fourth transmit symbols.
59. The method of claim 58, wherein the second and fourth mapping constellations are the same as the first and third mapping constellations, respectively.
60. The method of claim 56, wherein the transmitting the two matrices over the four time intervals comprises transmitting in a diversity order.
61. The method of claim 56, wherein the two matrices are located within a space time block code (�STBC�), and wherein remaining positions of the STBC are set to null.
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Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
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